Another topic from a year ago on this matter. They came up with some half decen ideas.
It isn't impossible.
Read the thread completely? It is impossible to make something accurate (for the Xth time )... accept it
I bet there is a way
People said the same about not being able to know if someone has you blocked, but you can find that out in seconds without the need of websites or downloads.
I'm sorry but I think you really should start to read threads in that case.
IT IS NOT POSSIBLE
(and block checking is also NOT POSSIBLE)
/ 
)... accept it
